installing hand priming pump on an m35a2?

[svd dragunov]

i dont know if this has been done before. i seached the forum and did a google search to no avail. just got done changing the oil and filters on my m35a2 and was getting ready to do the fuel filters. after doing some research i found out that most peoples lift pumps arent working. so after checking mine out i found out that it was indeed none functioning. was considering rebuilding the pump. and i got to thinking about installing on on board hand pumping primer.

my question is, has anyone tried this? without breaking some rules, i have found several places that have hand pumps for cummins engines. would this work?

any input would be welcome. thank you all.

 

[svd dragunov]

something like this

 

[eagle4g63]

I'm sure you could........the down side is after doing a filter change you have to pump your heart out to pull/push approximately a gallon of fuel to refill the filters and lines......

For the money and the trouble in installing this thing, you could just fix the problem with an external inline 24 volt fuel pump......airtex makes one and can be had for about $60..........and it would work like the original.........which does actually help your other pumps by having pressure feeding them, instead of them having to draw the fuel from the tank

 

[eagle4g63]

Plus being in line you only have to cut the copper tube coming out of the tank now and put it in there........easy as pie..........no extra fuel lines needed

 

[doghead]

And, they run best when supplied with fuel pressure. (as they were designed)

 

[cattlerepairman]

I remember driving a diesel wrecker that had a manual priming pump; it was a cabover and you had to open the lid in the cab, reach down into the bowels, find the round pump plunger head, turn a quarter turn to unlock and pump slowly for a while, preferably with the screw at the bottom of the fuel filter cracked open. Pump until fuel from the filter is no longer bubbly. The pump was either located on the filter base, between the two secondaries or on the injection pump, I can't remember.

These pumps are readily available, also on well known auction sites. Plumbing them in should not be too difficult. How useful...well...if you had an in-tank pump or a replacement self priming electric pump it would keep your arms cleaner!

 

[rosco]

There is a lot of deferred maintainance around. I think that you really want to have that lift pump working to fill your filters. I have one of those little primer pumps on my M37. But there, it is used to supply a little dab of gasoline directly into the intake manifold (which is drilled and tapped in 3 places).

 

[JasonS]

Why don't you buy one of the cheap $50 pumps from a popular online source?

 

[patracy]

Why don't you buy one of the cheap $50 pumps from a popular online source?

I did this. Problem solved.

 

[svd dragunov]

thanks for the info. i like the idea of the elecetric pump. but my line of thinking was "well of the original is fubar, then a replacement will probably not last long either" plus its always nice to have a mechanical option. maybe ill do both.........


p.s. whats the min psi needed in an electric pump?

 

[doghead]

iirc, 6 psi.

It's in the TM for sure.

FWIW, I've been running an in line pump on one of my trucks for a few years now with no trouble.

Search the site for "airtex" for more info on that option.

 

[svd dragunov]

thanks all. gonna see what i can do with it today.

 

[swbradley1]

thanks for the info. i like the idea of the elecetric pump. but my line of thinking was "well of the original is fubar, then a replacement will probably not last long either" plus its always nice to have a mechanical option. maybe ill do both.........


p.s. whats the min psi needed in an electric pump?

If it was the original only lasted 40 years what's the sense of putting in another that would probably last as long......

Airtex would be the way to go.

 

[svd dragunov]

well i went out this morning and pulled the cap lo and behold! blown fuse! put a temp bolt to complete the circuit, opened the valve, turned the switch it fired right up and launched a nice stream of fuel across my drive way. so now im gonna go get a fuse and put it back together. thanks everyone who chimed in. feel kinda dumb for not checking that first. oh well. on the plus side the pump sounds and works great!

 

[doghead]

You need a slow blow fuse.

Search "slow blow"

iirc, 3-5 amp.

All this is in the TM as well.

 

[svd dragunov]

done. put back together, and working great. guess ill see about changing the fuel filters next.

 

[frank8003]

now this one I like, not a mention of the exact online sale or exactly where it is but
it is and it follows the SS rules.
One attaboy

 

[Rusty nuts]

Why don't you buy one of the cheap $50 pumps from a popular online source?

I picked up one of those but the wiring on my original pump does not come unplugged like the new one. Can the new end be soldered and shrink tubed to make this work? Did your plug right in?

 

[Woodsplinter]

I had to do some "surgery" on my wire also. I cut and "unbraided" the wire sheath then cut the wire inside. I reconnected the new to old wiring using a butt connector that has glue inside that seals the connection when heated with heat gun. I then connected the braided sheath and soldered part of it back together.

I can't remember what those butt connectors are called- hopefully someone will chime in with the answer. Heat shrink tubing won't work- the diesel softens it up and the connection is exposed.

Hope this helps.